Mainspring Let Down Tool for Clock Repair

You are looking at a new, never used Mainspring Let Down Tool for use in wind-up clock repair
This tool allows for manual release of the clock's mainsprings so as not to injure the repairer
Sale includes everything pictured: handle and three keys
Keys are sized 5, 6, 7, 8, 10, and 12
Please feel free to ask any questions prior to bidding!